Shape memory polymer hexachiral auxetic structures with tunable stiffness

Jonathan M Rossiter, Kazuto Takashima, Fabrizio Scarpa, Peter Walters, Toshiharu Mukai

Research output: Contribution to journalArticle (Academic Journal)peer-review

98 Citations (Scopus)


Planar auxetic structures have the potential to impact on a wide range of applications from deployable and morphing structures to space-filling composite and medical treatments. The ability to fabricate auxetics from smart materials greatly enhances this facility by building in controllable actuation and deployment. A smart auxetic device can be compressed and fixed into a storage state. When deployment is required the device can be appropriately stimulated and the stored elastic energy is released, resulting in a marked structural expansion. Instead of using a conventional external actuator to drive deployment the material is made to undergo phase transition where one stimulus (e.g. heat) initiates a mechanical response. Here we show how smart material auxetics can be realized using a thermally responsive shape memory polymer composites. We show how a shape memory polymer auxetic hexachiral structure can be tailored to provide a tunable stiffness response in its fully deployed state by varying the angle of inter-hub connections, and yet is still able to undergo thermally stimulated deployment.
Original languageEnglish
Article number045007
JournalSmart Materials and Structures
Publication statusPublished - 28 Feb 2014

Structured keywords

  • Tactile Action Perception


  • auxetic
  • shape memory polymer
  • deployable structures
  • actuator


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